Composite catalyst for purifying indoor formaldehyde and preparation method thereof

A composite catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of catalyst active surface reduction, poor dispersion of nanoparticles, and poor catalytic decomposition effect, etc., to achieve The effect of convenient and practical operation, simple preparation process and low cost

Inactive Publication Date: 2018-10-16
ANHUI KEPU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these metal oxide catalysts have the problem of agglomeration of nanoparticles. Because the dispersion of nanoparticles is not good, the active surface of the catalyst will be reduced, and the actual use becomes difficult. In addition, generally speaking, the concentration of formaldehyde in the room is low and the degradation rate is relatively fast. Slow, if formaldehyde pollutants cannot be effectively adsorbed to the surface of the catalyst, the catalytic decomposition effect will not be good

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0012] The present invention has designed simultaneously the preparation method (abbreviation preparation method) of the composite catalyst of formaldehyde in the purification chamber of the present invention, this preparation method adopts the following steps: first with KMnO4, MnSO4 is raw material preparation MnO2 powder, the weight percentage of raw material consists of: KMnO4 1.0~20.0%, MnSO4 1.0~25.0% (carrier and MnO2 powder weight percentage doped with metal ions is 100%); Taking carrier activated carbon as an example, KMnO4 solution is adsorbed on the carrier activated carbon by immersion adsorption, and then passed The reducing agent MnSO4 solution reacts with the KMnO4 on the carrier activated carbon, so that the MnO2 powder is directly deposited on the surface and inside of the carrier activated carbon; then the carrier activated carbon is impregnated in a 0.5-2.0% doping metal ion solution by weight, After rotary evaporation and drying at 100°C, the MnO2 / carrier ac...

Embodiment 1

[0021] Weigh 10 grams of KMnO4 and 15.0 grams of MnSO4.H2O to make 200ml solution respectively, wash 15 grams of activated carbon powder with distilled water, boil for 1 hour, put it in a constant temperature box and dry it at 200°C for 3 hours, then pour it into the above-mentioned In the KMnO4 solution, let it soak for about 30 minutes under magnetic stirring until the purple color in the solution fades, filter out the activated carbon powder, dry naturally at room temperature until the particles do not stick to each other, and bake it in a drying oven at 120 ° C for 30 minutes before use; The above-mentioned MnSO4.H2O solution is poured into the above-mentioned treated activated carbon powder, and the activated carbon powder is required to be immersed in the corresponding MnSO4 solution. After shaking for 48 hours, filter, dry at 100°C for 12 hours, and impregnate the dry matter in AgNO3 with a weight concentration of 1.0%. solution, after rotary evaporation, and drying at 1...

Embodiment 2

[0024] The AgNO3 in Example 1 was replaced by ZnSO4, and the other raw material groups and process parameters remained unchanged, that is, the MnO2 / activated carbon composite catalyst containing zinc ions was obtained.

[0025] After testing, when the concentration of formaldehyde in the air is 10mg / L, the removal efficiency of formaldehyde is 95% after the obtained catalyst acts for 12 hours.

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Abstract

The invention discloses a composite catalyst for purifying indoor formaldehyde and a preparation method thereof. The catalyst is prepared from 99-90% by weight of a carrier and 1-10% by weight of metallic ion-doped MnO2 powder, the carrier contains activated carbon powder, activated carbon fiber powder or molecular sieve porous ultrafine particles, and the doped metallic ions are silver, copper orzinc ions. The preparation method comprises the following steps: using KMnO4 and MnSO4 as raw materials for preparing MnO2 powder, enabling a KMnO4 solution to be adsorbed on the carrier by immersionadsorption, and enabling a reducing agent MnSO4 solution to react with the KMnO4 on the carrier, so MnO2 powder generated by the reaction directly deposits on the surface of and inside the carrier; and immersing the carrier in a 0.5-2.0% doping metallic ion solution, and performing rotary evaporation and drying at 100 DEG C to prepare the MnO2/carrier compound type catalyst containing dopant ions.

Description

technical field [0001] The invention relates to composite catalyst technology, in particular to a composite catalyst for purifying indoor formaldehyde and a preparation method thereof. Background technique [0002] Formaldehyde is an environmental pollutant that has an important impact on the quality of human settlements in urban ecosystems. Indoor formaldehyde has a wide range of sources and a long release period, which is extremely harmful to the human body. In 2004, the International Center for Research on Cancer (IARC) identified formaldehyde as a carcinogen in the No. 153 "Formaldehyde Carcinogenic" Bulletin. It ranks second on the list of priority control of toxic chemicals in our country. The toxicity of formaldehyde includes general toxicity and special toxicity. Long-term (14-30 years) use of formaldehyde and formalin can lead to loss of central nervous system function. Therefore, the control of indoor formaldehyde pollution is urgent. [0003] For indoor forma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J23/34B01J23/889B01J29/00B01J37/03B01D53/86B01D53/72
CPCB01J23/688B01D53/8668B01J23/34B01J23/8892B01J29/00B01J37/035B01J2229/18
Inventor 柯结军
Owner ANHUI KEPU ENVIRONMENT TECH CO LTD
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